Hello. Today I was planning on whitening my teeth with some whitening strips that I knew I had. When I found them, I realized they were expired in 04/2009. I know it sounds crazy, but how bad is that? I mean, will it make any effect on my teeth (positive or negative?). The best solution would go to a pharmacy and get a new box BUT they are not easy to find in the country where I live. That's why I'm asking here whether if I should use them or not and what effect will my teeth have. Thanks!
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try not to use it, because the whitening strips contain of hydrogen pexoride, is a chemical that help to bleaching your teeth.
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